The latest OS X 10.9.4 Mavericks build 13E25 continues Apple's usual one-week release interval and follows build 13E19 seeded last week.
Thursday's release focuses on the same areas, including Graphics Drivers, Safari, Bluetooth, Audio Drivers, Finder and the App Store.
The initial seed was issued at the end of May following the public release of OS X 10.9.3. Along with developers, Apple announced a limited number of consumers can also take part in testing out betas seeds.
Developers can download the latest builds via Apple's Developer Portal or Software Update.